CN110042320A - A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof - Google Patents
A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses a kind of 500MPa grades of automotive light weight technology cold-rolled biphase steels, content including following mass percent: C:0.06~0.08%, Si:0.05~0.10%, Mn:1.30~1.40%, P :≤0.010%, S :≤0.005%, Alt:0.020~0.060%, Cr:0.020~0.030%, remaining is Fe and inevitable impurity.Preparation method is also disclosed.Cold-rolled biphase steel of the invention has the characteristics that low yield strength ratio, high initial manufacture hardening rate, good intensity and ductility matching, meets the needs of automotive light weight technology selection, mechanical property and processing performance meet the requirement of GB/T 20564.2-2006.
Description
Technical field
The present invention relates to technical field of metallurgical sheet production more particularly to a kind of 500MPa grades of automotive light weight technology cold rolling two-phases
Steel and preparation method thereof.
Background technique
China's automobile sales volume in 2018 breaks through 2323.7 ten thousand, the continuous 10 years residences whole world first, it is contemplated that automobile produced in 2025
Amount reaches 35,000,000.As the burst of auto output increases, environment and energy crisis are increasingly sharpened, and energy-saving and emission-reduction have become
The significant problem that auto manufacturing faces.The weight for mitigating components or vehicle with modern technologies and method, pacifies ensureing
Under the premise of congruent performance, realize that energy-saving and emission-reduction consumption reduction target has become common recognition by loss of weight, automotive light weight technology technology has become
For the trend of current automotive industry.
Cold-rolled biphase steel is by two phase composition of ferrite and martensite, based on phase transformation strengthening, has low yield strength ratio, high
The features such as initial manufacture hardening rate, good intensity and ductility cooperate, have evolved into a kind of automobile high-strength Novel flushing
Pressure uses steel.500MPa grades of cold-rolled biphase steels are in automobile structure and covering application aspect: comparing low-alloy high-strength steel, carbon knot
Structure steel and baking hardened steel, under the premise of same intensity rank, steel plate is thinner, is that automotive light weight technology weight loss effect is brighter
It is aobvious, and yield strength with higher after forming, make part that there is preferable concave resistance；Production aspect: be not required to addition Nb,
The noble metals such as Ti, Mo can reduce production cost.Therefore 500MPa grades of cold-rolled biphase steels are that automobile panel and ordinary construction part are real
Existing light-weighted preferable selection.
Currently, 500MPa grades of cold-rolled biphase steel researchs are less.Handan Branch Company of Hebei Iron and Steel Co., Ltd.'s production
470MPa grades of cold-rolled biphase steel (470MPa grades of cold-strip steels and its production method, application number 201410530367.4) ingredient designs
In element containing Nb and Ti element, Nb and Ti alloy is expensive, and Nb content is higher (0.050%), increase ton steel cost, the present invention at
Set up meter separately and expensive metal Nb and Ti is not added, production cost can be reduced；Handan Branch Company of Hebei Iron and Steel Co., Ltd.'s production
500MPa cold-rolled biphase steel (500MPa grades of cold-rolled biphase steels and its production method, application number 201410536158.0) chemical component
Design is higher containing Si (0.35%) and Mn (1.45%), increases ton steel cost, and Si content height easily causes steel strip surface iron oxide
Skin is difficult to remove, and increases pickling difficulty, and steel strip surface quality is more difficult to control, and Mn content height influences steel band welding performance.The present invention
Chemical component is designed using low Si, and Mn content is lower, can not only reduce production cost, but also steel strip surface quality is more easily-controllable
System.
Summary of the invention
The object of the present invention is to provide a kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel and preparation method thereof, the present invention
Cold-rolled biphase steel have the characteristics that low yield strength ratio, high initial manufacture hardening rate, good intensity and ductility matching, meet
The needs of automotive light weight technology selection, mechanical property and processing performance meet the requirement of GB/T20564.2-2006.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel, the content including following mass percent: C:0.06~
0.08%, Si:0.05~0.10%, Mn:1.30~1.40%, P :≤0.010%, S :≤0.005%, Alt:0.020~
0.060%, Cr:0.020~0.030%, remaining is Fe and inevitable impurity.
Further, the content including following mass percent: C:0.080%, Si:0.05%, Mn:1.40%, P:
0.009%, S:0.002%, Alt:0.040%, Cr:0.024%, remaining is Fe and inevitable impurity.
Further, the content including following mass percent: C:0.071%, Si:0.10%, Mn:1.36%, P:
0.007%, S:0.005%, Alt:0.035%, Cr:0.025%, remaining is Fe and inevitable impurity.
Further, the content including following mass percent: C:0.0681%, Si:0.07%, Mn:1.316%, P:
0.005%, S:0.002%, Alt:0.050%, Cr:0.022%, remaining is Fe and inevitable impurity.
A kind of preparation method of 500MPa grades of automotive light weight technology cold-rolled biphase steel, comprising:
S1, smelting-continuous casting manufacturing technique process: molten iron pretreatment-converter-LF refining-casting machine, for casting machine molten steel at
It is divided into C:0.06~0.08%, Si:0.05~0.10%, Mn:1.30~1.40%, P :≤0.010%, S :≤0.005%,
Alt:0.020~0.060%, Cr:0.020~0.030%；
S2, hot-rolled production process process: slab heating-roughing-finish rolling-is batched；The slab tapping temperature 1210 ±
20 DEG C, the roughing uses the 2 machine frame rolling mill roughing of 3+3 mode, and finish rolling uses 7 rack continuously variable crown milling train finish rolling, intermediate base
40~45mm of thickness；1010 ± 30 DEG C of the start rolling temperature of the finish rolling, the finishing temperature of the finish rolling are 860 ± 20 DEG C, hot rolling
Thickness of strips 4.0mm；Cooling to use section cooling equipment, front refrigerating mode, cooling velocity is 20 ± 5 DEG C/s, coiling temperature
It is 650 ± 20 DEG C；
S3, pickling and cold-rolling process flow: by hot-strip through i-BOX technology hydrochloric acid trough pickling, scale on surface is removed
Afterwards, by 5 rack rolled by cold rolling machine, cold rolling reduction ratio is 65%, is rolled to target thickness；
S4, continuous annealing process process: will be heated to 810 ± 20 DEG C after chill volume steel band uncoiling, keep the temperature 80~120S, with
The speed of 3~5 DEG C/s is cooled to 680 ± 20 DEG C, is then cooled to 280 ± 20 DEG C with the cooling velocity greater than 45 DEG C/s, overaging
It is cooled to 150 DEG C eventually after 400~500S of processing, is air-cooled to room temperature.
Further, target thickness is 1.4mm in the S3.
Further, the Wetted constructures time is 440S in the S4.
Further, 1030 DEG C of finish rolling start rolling temperature in the S2, finish rolling finishing temperature is 879 DEG C.
Further, 1030 DEG C of finish rolling start rolling temperature in the S2, finish rolling finishing temperature is 875 DEG C.
Compared with prior art, advantageous effects of the invention:
The microscopic structure of cold-rolled biphase steel of the invention be ferrite+martensite, Martensite Volume Fraction be 12%~
15%, about 11.5 grades of grain size, there is low yield strength ratio, high initial manufacture hardening rate, good intensity and ductility matching etc.
Feature, meets the needs of automotive light weight technology selection, and mechanical property and processing performance meet the requirement of GB/T 20564.2-2006.
Meanwhile cost of alloy of the present invention is low, preparation method is simple, is suitble to industrialized production.
Detailed description of the invention
The invention will be further described for explanation with reference to the accompanying drawing.
Fig. 1 is the micro-organization chart of the embodiment of the present invention 1.
Specific embodiment
It is for a more detailed description to the present invention below by way of specific embodiment.Embodiment is only to best implementation of the invention
The description of mode, does not have any restrictions to the scope of the present invention.
Embodiment 1
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting
The whole Argon of smelting, steel scrap addition converter, 1630 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace
Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component
As shown in table 1.The sheet billet continuous casting degree of superheat is 20 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later.Slab adds
Hot temperature is 1225 DEG C, heating time 220min, and the slab after heating is carried out high pressure water dephosphorization.It is fixed by fixed-width pressure machine
Width, using 2 rack roughing, 7 rack CVC finish rolling.1020 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is 860 DEG C, finished product thickness
4.0mm.Section cooling is cooling using front, and 20 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.By hot rolling
Strip uses the i-BOX technology of MH recent development through hydrochloric acid trough pickling, the acid tank, and operation and maintenance greatly simplifies, and saves the energy
And labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is 65%, is rolled
To target thickness 1.4mm.Chill volume continuous annealing carries out in the vertical continuous annealing furnace with HGJC function, and steel band is in Lu Qu
The speed of service is 120m/min, 805 DEG C of soaking temperature, soaking time 120S, 675 DEG C of rapid cooling start temperature, 45 DEG C of rapid cooling cooling rate/
S, 280 DEG C of overaging temperature, overaging time 440S, 150 DEG C of final cooling temperature, smooth elongation percentage 0.8%.Finally carry out product
It can detection.
Fig. 1 be preparation product micro-organization chart, be ferrite+martensite, Martensite Volume Fraction be 12%~
15%, about 11.5 grades of grain size.
Embodiment 2
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting
The whole Argon of smelting, steel scrap addition converter, 1610 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace
Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component
As shown in table 1.The sheet billet continuous casting degree of superheat is 22 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later.Slab adds
Hot temperature is 1228 DEG C, and the time of heating is 231min, and the slab after heating is carried out high pressure water dephosphorization.Pass through fixed-width pressure machine
Fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is 875 DEG C, and finished product is thick
Spend 4.0mm.Section cooling is cooling using front, and 25 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot
Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy
Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is 65%,
It is rolled to target thickness 1.4mm.Chill volume continuous annealing carries out in the vertical continuous annealing furnace with HGJC function, and steel band is in furnace
Area's speed of service be 150m/min, 815 DEG C of soaking temperature, soaking time 100S, 682 DEG C of rapid cooling start temperature, rapid cooling cooling rate 48
DEG C/S, and 291 DEG C of overaging temperature, overaging time 400S, 150 DEG C of final cooling temperature, smooth elongation percentage 0.8%.Finally produced
Product performance detection.
Embodiment 3
Molten iron is subjected to desulfurization pretreatment, so that molten steel decarburization, dephosphorization is obtained molten steel, converter using top and bottom combined blown converter smelting
The whole Argon of smelting, steel scrap addition converter, 1640 DEG C of Tapping Temperature of Bof.Then molten steel after converter smelting is subjected to essence outside LF furnace
Refining refines temperature >=1560 DEG C in place, and LF external refining carries out thermometric and trimming, and LF external refining is for casting machine chemical component
As shown in table 1.The sheet billet continuous casting degree of superheat is 29 DEG C, carries out slab cleaning, slow cooling and continuous casting billet quality inspection later.Slab adds
Hot temperature is 1220 DEG C, and the time of heating is 230min, and the slab after heating is carried out high pressure water dephosphorization.Pass through fixed-width pressure machine
Fixed width, using 2 rack roughing, 7 rack CVC finish rolling.1030 DEG C of finish rolling start rolling temperature, finish rolling finishing temperature is 879 DEG C, and finished product is thick
Spend 4.0mm.Section cooling is cooling using front, and 23 DEG C/s of cooling velocity, temperature of steel strips is reduced to 650 DEG C and is batched.It will be hot
Strip is rolled through hydrochloric acid trough pickling, which uses the i-BOX technology of MH recent development, and operation and maintenance greatly simplifies, and saves energy
Source and labour, after hot-strip removes scale on surface, by 5 rack UCM milling train cold rollings, cold rolling reduction ratio is 65%,
It is rolled to target thickness 1.4mm.Chill volume continuous annealing carries out in the vertical continuous annealing furnace with HGJC function, and steel band is in furnace
Area speed of service 140m/min, 820 DEG C of holding temperature, soaking time 108S, 680 DEG C of rapid cooling start temperature, 55 DEG C of rapid cooling cooling rate/
S, 278 DEG C of overaging temperature, overaging time 460S, 150 DEG C of final cooling temperature, smooth elongation percentage 0.8%.Finally carry out product
It can detection.
The chemical component (wt%) of 1 embodiment of the present invention 1~3 of table
| Embodiment | C | Si | Mn | P | S | Alt | Cr |
| 1 | 0.080 | 0.05 | 1.40 | 0.009 | 0.002 | 0.040 | 0.024 |
| 2 | 0.071 | 0.10 | 1.36 | 0.007 | 0.005 | 0.035 | 0.025 |
| 3 | 0.068 | 0.07 | 1.31 | 0.005 | 0.002 | 0.050 | 0.022 |
Mechanical properties test is carried out to the coil of strip of the embodiment of the present invention 1~3, inspection result is shown in Table 2.
The mechanical property of the coil of strip of 2 embodiment of the present invention 1~3 of table
From the data in table 2, it can be seen that a kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel mechanical property of the present invention and craftsmanship
The requirement of GB/T 20564.2-2006 can be met.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (9)
1. a kind of 500MPa grades of automotive light weight technology cold-rolled biphase steel, which is characterized in that the content including following mass percent: C:
0.06~0.08%, Si:0.05~0.10%, Mn:1.30~1.40%, P :≤0.010%, S :≤0.005%, Alt:
0.020~0.060%, Cr:0.020~0.030%, remaining is Fe and inevitable impurity.
2. 500MPa grades of automotive light weight technology cold-rolled biphase steel according to claim 1, which is characterized in that including following quality
The content of percentage: C:0.080%, Si:0.05%, Mn:1.40%, P:0.009%, S:0.002%, Alt:0.040%,
Cr:0.024%, remaining is Fe and inevitable impurity.
3. 500MPa grades of automotive light weight technology cold-rolled biphase steel according to claim 1, which is characterized in that including following quality
The content of percentage: C:0.071%, Si:0.10%, Mn:1.36%, P:0.007%, S:0.005%, Alt:0.035%,
Cr:0.025%, remaining is Fe and inevitable impurity.
4. 500MPa grades of automotive light weight technology cold-rolled biphase steel according to claim 1, which is characterized in that including following quality
The content of percentage: C:0.0681%, Si:0.07%, Mn:1.316%, P:0.005%, S:0.002%, Alt:0.050%,
Cr:0.022%, remaining is Fe and inevitable impurity.
5. a kind of preparation method of 500MPa grades of automotive light weight technology cold-rolled biphase steel characterized by comprising
S1, smelting-continuous casting manufacturing technique process: molten iron pretreatment-converter-LF refining-casting machine is for casting machine molten steel composition
C:0.06~0.08%, Si:0.05~0.10%, Mn:1.30~1.40%, P :≤0.010%, S :≤0.005%, Alt:
0.020~0.060%, Cr:0.020~0.030%；
S2, hot-rolled production process process: slab heating-roughing-finish rolling-is batched；The slab tapping temperature 1210 ± 20
DEG C, the roughing uses the 2 machine frame rolling mill roughing of 3+3 mode, and finish rolling uses 7 rack continuously variable crown milling train finish rolling, and intermediate base is thick
Spend 40~45mm；1010 ± 30 DEG C of the start rolling temperature of the finish rolling, the finishing temperature of the finish rolling are 860 ± 20 DEG C, hot-rolled steel
Tape thickness 4.0mm；Cooling to use section cooling equipment, front refrigerating mode, cooling velocity is 20 ± 5 DEG C/s, and coiling temperature is
650±20℃；
S3, pickling and cold-rolling process flow: by hot-strip through i-BOX technology hydrochloric acid trough pickling, after removing scale on surface, warp
5 rack rolled by cold rolling machine are crossed, cold rolling reduction ratio is 65%, is rolled to target thickness；
S4, continuous annealing process process: will be heated to 810 ± 20 DEG C after chill volume steel band uncoiling, 80~120S be kept the temperature, with 3~5
DEG C/speed of s is cooled to 680 ± 20 DEG C, 280 ± 20 DEG C then are cooled to the cooling velocity greater than 45 DEG C/s, Wetted constructures
It is cooled to 150 DEG C after 400~500S eventually, is air-cooled to room temperature.
6. preparation method according to claim 1, which is characterized in that target thickness is 1.4mm in the S3.
7. preparation method according to claim 1, which is characterized in that the Wetted constructures time is 440S in the S4.
8. preparation method according to claim 1, which is characterized in that 1030 DEG C of finish rolling start rolling temperature, finish rolling in the S2
Finishing temperature is 879 DEG C.
9. preparation method according to claim 1, which is characterized in that 1030 DEG C of finish rolling start rolling temperature, finish rolling in the S2
Finishing temperature is 875 DEG C.
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| CN116334501A (en) * | 2023-03-31 | 2023-06-27 | 包头钢铁（集团）有限责任公司 | High-yield strength 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
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| CN109161805A (en) * | 2018-10-24 | 2019-01-08 | 包头钢铁（集团）有限责任公司 | A kind of 590MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
| CN109321825A (en) * | 2018-10-24 | 2019-02-12 | 包头钢铁（集团）有限责任公司 | A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
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| CN109161805A (en) * | 2018-10-24 | 2019-01-08 | 包头钢铁（集团）有限责任公司 | A kind of 590MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
| CN109321825A (en) * | 2018-10-24 | 2019-02-12 | 包头钢铁（集团）有限责任公司 | A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116334501A (en) * | 2023-03-31 | 2023-06-27 | 包头钢铁（集团）有限责任公司 | High-yield strength 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
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